iOS 10 custom navigation bar height - ios

Question

I implemented custom navigation bar height, by subclassing it with following code
class TMNavigationBar: UINavigationBar {
///The height you want your navigation bar to be of
static let navigationBarHeight: CGFloat = 44.0
///The difference between new height and default height
static let heightIncrease:CGFloat = navigationBarHeight - 44
override init(frame: CGRect) {
super.init(frame: frame)
initialize()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initialize()
}
private func initialize() {
let shift = TMNavigationBar.heightIncrease/2
///Transform all view to shift upward for [shift] point
self.transform =
CGAffineTransformMakeTranslation(0, -shift)
}
override func layoutSubviews() {
super.layoutSubviews()
let shift = TMNavigationBar.heightIncrease/2
///Move the background down for [shift] point
let classNamesToReposition: [String] = ["_UINavigationBarBackground"]
for view: UIView in self.subviews {
if classNamesToReposition.contains(NSStringFromClass(view.dynamicType)) {
let bounds: CGRect = self.bounds
var frame: CGRect = view.frame
frame.origin.y = bounds.origin.y + shift - 20.0
frame.size.height = bounds.size.height + 20.0
view.frame = frame
}
}
}
override func sizeThatFits(size: CGSize) -> CGSize {
let amendedSize:CGSize = super.sizeThatFits(size)
let newSize:CGSize = CGSizeMake(amendedSize.width, TMNavigationBar.navigationBarHeight);
return newSize;
}
}
Following problem occurs only on iOS 10: (black space between bar & view)
No idea what's happening there. But in storyboard it's generated this warning, and there's no way to fix it in IB (warning only appears when i change subclass of navigation bar in IB).

Answer 1

Works on iOS 10, Swift 3.0:
extension UINavigationBar {
open override func sizeThatFits(_ size: CGSize) -> CGSize {
let screenRect = UIScreen.main.bounds
return CGSize(width: screenRect.size.width, height: 64)
}
}

Answer 2

I checked Interface debugger and this is what i see (so basically it's trying to change navigation bar height, bit it's stays same and it's showing just black space - which is window color):
With later investigation i noticed that it's not calling: "_UINavigationBarBackground"
Then i checked view.classForCoder from fast enumeration, and discovered that key is changed to "_UIBarBackground", so i updated layoutSubviews():
override func layoutSubviews() {
super.layoutSubviews()
let shift = TMNavigationBar.heightIncrease/2
///Move the background down for [shift] point
let classNamesToReposition = isIOS10 ? ["_UIBarBackground"] : ["_UINavigationBarBackground"]
for view: UIView in self.subviews {
if classNamesToReposition.contains(NSStringFromClass(view.classForCoder)) {
let bounds: CGRect = self.bounds
var frame: CGRect = view.frame
frame.origin.y = bounds.origin.y + shift - 20.0
frame.size.height = bounds.size.height + 20.0
view.frame = frame
}
}
}
Cheers.